污染控制技术及原理
刘兴隆,曾立民,陆思华,于雪娜.大气中挥发性有机物在线监测系统[J].环境科学学报,2009,29(12):2471-2477
大气中挥发性有机物在线监测系统
- Online monitoring system for volatile organic compounds in the atmosphere
- 基金项目：国家高技术研究发展计划(863)项目(No.2006AA06A301)
- 作者
- 单位
- 刘兴隆
- 北京大学环境科学与工程学院, 环境模拟与污染控制国家重点联合实验室, 北京 100871
- 曾立民
- 北京大学环境科学与工程学院, 环境模拟与污染控制国家重点联合实验室, 北京 100871
- 陆思华
- 北京大学环境科学与工程学院, 环境模拟与污染控制国家重点联合实验室, 北京 100871
- 于雪娜
- 北京大学环境科学与工程学院, 环境模拟与污染控制国家重点联合实验室, 北京 100871
- 摘要：一种新型的监测大气中挥发性有机物(包括含氧挥发性有机物)的在线监测系统被研制,即将超低温冷阱捕集-热解析装置与气相色谱-质谱仪联用.其分析方法是大气样品经除水、除O3后以60mL·min-1的流速通过温度为-150℃的超低温冷阱捕集5min,然后样品在110℃下解析后进入GC-FID/MS系统进行分析,时间分辨率为1h.系统使用混和标气进行标定.目标化合物定量曲线的R2值为0.9137～0.9998,相对标准偏差(RSD)均小于10%.将系统与相关商业化的VOC在线监测仪器进行比对,对于相同目标化合物进行分析,其相关系数r在0.7412～0.9620之间.
- Abstract：A new online monitoring system for atmospheric volatile organic compounds,including oxygenated volatile organic compounds,was developed with a combination of cryo-trapping-thermal desorption and GC-FID/MS(Gas chromatography-Flame Ionization Detector/Mass Spectrometry).Water and ozone were removed to avoid interference.Ambient air was collected with an air flow rate of 60 mL·min-1 at-150℃ for 5 minutes,then the sample was desorbed by heating to 110℃ and the volatile organic compounds were detected by GC-FID/MS.The time resolution is 1h.The system was calibrated with multi-component standards.The calibration results indicated good regression results for target compounds with R2=0.9137～0.9998 and relative standard deviation(RSD%)below 10%.The newly developed system showed a similar variation of VOC species concentrations to those currently used in commercial online instruments,and the correlation coefficients(r) ranged between 0.7412 and 0.9620.
- Key words：VOCs cryo-trapping online monitoring GC-FID/MS
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